Brake attachment



W. B. UFFERT.

BRAKE ATTACHMENT.

APPLICATION FILED NOV-12, 1919.

2 SHEETS-SHEET I.

Z5: JG.

W. B. UFFERT.

BRAKE ATTACHMENT. APPLICATION FILED NOV. 12, 1919.

2 SHEETS-SHEET 2- Q Patented Dem 6 1921.

- anai.

, Application filed November To all whom it may concern:

Be it known that T, WALTER B, llrrnnn a citizen of the United States, residing at Jamaica, Long Island, in the county of Queens and State of New York, have invented certain new and useful Improvements inBrake.v Attachments; and '1 do hereby declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which V it appertains to make and use the same.

This invention relates to new and useful improvements in brake attachments and has for'one of its objects the provision of means for positively locking either pneumatic or manually operated brakes of a car in an applied position so as to obviate any danger of the brakes being accidentally released while the car is unattended. it

-Another object ofthis invention is the provision of a brake attachment of the above stated character, which shall be simple, durable and efficient, and which may be manufactured and sold at a comparatively low cost.

With these and other objects in view as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination, and arrangement of parts as will be hereinafter more fully described and I claimed.

For a complete understanding of my invention, reference is to be had to the follow ing description and accompanyingdrawings,

- in which,

Figure 1 1s a side elevation of a brake attachment constructed in accordance with my invention and illustrating the same applied to a car,

Fig.- 2 is a detail View partly 'in'sectlon of the same, 7

Fig. 3 is a transverse sectional view taken on the line 8--3 of Fig. 2,

Fig. f is an end view of the deviceillustrating the manner of operating the dog.

Fig. 5 is a detail sectional view, illustrating a two-way valve.

Referring in detail to the drawings, the numeral 1 indicates a car having thereon an air-brake system 2 consisting of a reservoir 3 to which are connected pipes 4 leading to controlling valves The controlling valves 5 are located in each end of the car and have connected thereto pipes 6 that lead Specificationot Letters Patent.

it, rare. serial No. aerate] J i I Patented Deco 116 v to a brake cylinder 7. The valves 5 also 1 have connected thereto exhaust pipes 8.

The brake cylinder 7 is supportedfby I hangers 9 secured to the bottom of the car land has reciprocally mounted therein a piston 10 to which is connected a piston rod 11. r The piston rod 11by means of a pivot pin 11' is adapted to be connected to the ordinary brake mechanism of the car (not shown). A spring12 is located within the pylinder 7 for the purpose of forcing the piston 10 to its non-brake applying position when the air has been exhausted from the cylinder. 1

The foregoing description relates to a well known construction of air-brake system to which my invention is applied.

Upper and lower pairs of brace rods 13 have one of their ends secured to the brake cylinder 7 and their other ends connected to hangers 1a.. The upper ends of the hangers 14L are secured to the under face of the car a 1. A roller 15 is journaled between the hangers 14 and has slidably mounted thereon a rack bar 16 which is pivoted to the plstonrod 11. A shaft 17 is carried by the hangers It and has journaled thereon a dog 18 adapted to engage the teeth of the rack bar 16 for preventing the piston 10 from returning under the influenceof the spring 12 to a non-brake-applying position. i

The dog 18 is normally held out of engagement with the rack barlfi by means of a spring 18' secured to the same and to the car? A lever 19 is secured to the shaft 17 and has pivoted thereto a piston rod 20 slidable within an auxiliary cylinder 21 and carries upon its inner end a piston 22 The cylinder 21 is provided with an intake end'to which is connectedan intake pipe 23. The pipe-23' connects with a pipe 24 which is in turn con nected to the exhaust two-way valves 25 o struction. I

A'coil spring 26 is located within the auxiliary cylinder 21 for the purpose of norma'lly urging the piston 22 in the direction any desired conpipes 8 by means of of the intake end for the purpose of aiding ltd valves 25 are positioned to direct the exhaust air to the auxiliary cylinder 21 by wayof the pipes 24 and 23 which forces the piston 22 against the tension of the spnng, throwing the dog 18 downward in engagement with the teeth of the rack bar 16, positively locking the brakes in an applied position. When the brakes are applled in the usual manner, the rack bar 16 is moved forwardly during the forward movement of the piston 10. -When it is desired to release the rakes after being positively locked by the device, the two-way valves 25 are so positioned that the air within the auxiliary cylinder 21 may exhaust outwardly through the ports 25 of said valves 25.

' If desired, the device can be manually operated, instead of being operated by pneumatic means and in this case, an arm 28 is secured to the shaft 17 and has connected thereto rods 29 which are in turn connected- 7 to levers 30. The levers 30 are pivoted adjacent the ends of the car in convenient reach of the motorman or operator and have con;

.nected thereto foot pedals 31 so that upon pressing the foot pedals, the dog 18 will be thrown into engagement with the rack bar.

While I have shown and described the preferred embodiment of my invention,' it will be understood that minor changes in construction, combination, and arrangement of parts may be made without departing from the spirit and scope of. the invention .as claimed.

Having thus described my invention, what- I claim 1s:-

1. In combination, an air brake system including a cylinderhaving a piston connected to a brake rigging. and an air pressure source connected to the cylinder and equipped with a controlling valve having an exhaust pipe, a rack bar secured to the pis ton and movable therewith, an auxiliary cylinder, a piston in said last cylinder, a pivoted dog connected to the last piston and adapted to be moved by the latter to engage the rack bar, a pipe connected to the auxiliary cylinder, and an auxiliary controlling valve connecting said last pipe to the exhaust pipe for directing air pressure ex hausted fromsaid first controlling valve into the auxiliarycylinder for actuating the dog and said auxiliary controlling valve being adapted to be positioned to permitthe exhaust air pressure from the first named valve to escape to the atmosphere and to permit the air pressure flto escape from the auxiliary cylinder. I j i 2. An air brake attachment comprising a rack bar secured to the piston of an air brake system, a pivoted dog associated with the rack bar and normally disengaged therefrom, a piston connected to said dog, a cylinder for said last piston, a pipe connected to the cylinder, a two-way valve connecting said pipe to the exhaust pipe of the controlling valve of the air brake system for directing air pressure from said controlling valve intothe cylinder for actuating the dog to hold the rack bar, and said two-way valve capable of being positioned to permit the air pressure from the controlling valve to escape to the atmosphere and also permit the air pressure from the cylinder to escape.

In testimony whereof I afiix my signature O, W. Gunmen, JOHN, Smvnr. 

